lemon vs sapidity

lemon and sapidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
lemon	Yes	No	No	No
sapidity	Yes	No	No	No

As nouns, sapidity is a hypernym of lemon; that is, sapidity is a word with a broader meaning than lemon:

lemon: a distinctive tart flavor characteristic of lemons
sapidity: the taste experience when a savoury condiment is taken into the mouth

Other hypernyms of lemon include flavor, flavour, nip, relish, savor, savour, smack, tang.

lemon (noun)	sapidity (noun)
an artifact (especially an automobile) that is defective or unsatisfactory	a pleasant flavor
a strong yellow color	the taste experience when a savoury condiment is taken into the mouth
a distinctive tart flavor characteristic of lemons
yellow oval fruit with juicy acidic flesh
a small evergreen tree that originated in Asia but is widely cultivated for its fruit